4.3-4.4, due January 29

1. (difficult)  I don't understand result 4.16 and the subsequent proof for it. I read over it a couple of times, and I don't see how the proof arrived at. It seems to take the exact same expression and reworks it to prove itself. Something to the effect of: Prove 5x=y. Well, 5x-y=0, so 5x=y. It just doesn't seem very logical to me.
2. (reflective) The set algebra is tricky. I was honestly hoping that we'd left behind the set notations and intersections, differences, subsets, unions, compliments, etc... But of course we will be using them probably on and off through the course.

• How long have you spent on the homework assignments? Did lecture and the reading prepare you for them?
• I have spent roughly one hour on each assignment and one hour on readings and bloggings per assignment. However, the LaTeX assignments usually takes me longer than just writing it. The reading and lectures adequately prepared me for the assignments.
• What has contributed most to your learning in this class thus far?
• reading and writing blog posts about the material
• What do you think would help you learn more effectively or make the class better for you? (This can be feedback for me, or goals for yourself.)
• I often do the homework assignments during class lectures, so I would like to have them done either before or afterward and take that time to listen and ask my questions.